gr-gsm/lib/misc_utils/bursts_printer_impl.cc

/* -*- c++ -*- */
/*
 * @file
 * @author (C) 2014 by Piotr Krysik <ptrkrysik@gmail.com>
 * @section LICENSE
 *
 * Gr-gsm is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * Gr-gsm is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with gr-gsm; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <gnuradio/io_signature.h>
#include <grgsm/gsmtap.h>
#include <grgsm/endian.h>
#include <iterator>
#include <algorithm>
#include "bursts_printer_impl.h"
//#include <unistd.h>
#include <iostream>
extern "C" {
    #include <osmocom/gsm/a5.h>
}

namespace gr {
  namespace gsm {
    boost::mutex printer_mutex;
    // dummy burst defined in gsm 05.02, section 5.2.6
    const int8_t bursts_printer_impl::d_dummy_burst[] = {0,0,0,
        1,1,1,1,1,0,1,1,0,1,1,1,0,1,1,0,
        0,0,0,0,1,0,1,0,0,1,0,0,1,1,1,0,
        0,0,0,0,1,0,0,1,0,0,0,1,0,0,0,0,
        0,0,0,1,1,1,1,1,0,0,0,1,1,1,0,0,
        0,1,0,1,1,1,0,0,0,1,0,1,1,1,0,0,
        0,1,0,1,0,1,1,1,0,1,0,0,1,0,1,0,
        0,0,1,1,0,0,1,1,0,0,1,1,1,0,0,1,
        1,1,1,0,1,0,0,1,1,1,1,1,0,0,0,1,
        0,0,1,0,1,1,1,1,1,0,1,0,1,0,
        0,0,0 };

    void bursts_printer_impl::bursts_print(pmt::pmt_t msg)
    {
        pmt::pmt_t header_plus_burst = pmt::cdr(msg);

        gsmtap_hdr * header = (gsmtap_hdr *)pmt::blob_data(header_plus_burst);
        int8_t * burst = (int8_t *)(pmt::blob_data(header_plus_burst))+sizeof(gsmtap_hdr);
        size_t burst_len=pmt::blob_length(header_plus_burst)-sizeof(gsmtap_hdr);
        uint32_t frame_nr = be32toh(header->frame_number);

        if (d_ignore_dummy_bursts && is_dummy_burst(burst, burst_len))
        {
            return;
        }

        std::ostringstream out;
        out << d_prepend_string;
        if (d_prepend_fnr)
        {
            out << frame_nr;
        }

        if (d_prepend_fnr && d_prepend_frame_count)
        {
            out << " ";
        }

        if (d_prepend_frame_count)
        {
            // calculate fn count using libosmogsm
            out << osmo_a5_fn_count(frame_nr);
        }

        if (d_prepend_fnr || d_prepend_frame_count)
        {
            out << ": ";
        }

        if (d_print_payload_only)
        {
            for (int ii=0; ii<57; ii++)
            {
                out << std::setprecision(1) << static_cast<int>(burst[ii + 3]);
            }
            for (int ii=0; ii<57; ii++)
            {
                out << std::setprecision(1) << static_cast<int>(burst[ii + 88]);
            }
        }
        else
        {
            for(int ii=0; ii<burst_len; ii++)
            {
              out << std::setprecision(1) << static_cast<int>(burst[ii]);
            }
        }

        out << std::endl;
        std::cout << out.str() << std::flush;
    }

    bool bursts_printer_impl::is_dummy_burst(int8_t *burst, size_t burst_len)
    {
        if (burst_len != DUMMY_BURST_LEN)
        {
            return false;
        }
        for (int i=0; i<DUMMY_BURST_LEN; i++)
        {
            if (burst[i] != d_dummy_burst[i])
            {
                return false;
            }
        }
        return true;
    }

    bursts_printer::sptr
    bursts_printer::make(pmt::pmt_t prepend_string, bool prepend_fnr,
        bool prepend_frame_count, bool print_payload_only,
        bool ignore_dummy_bursts)
    {
      return gnuradio::get_initial_sptr
        (new bursts_printer_impl(prepend_string, prepend_fnr, prepend_frame_count,
            print_payload_only, ignore_dummy_bursts));
    }

    /*
     * The private constructor
     */
    bursts_printer_impl::bursts_printer_impl(pmt::pmt_t prepend_string, bool prepend_fnr,
        bool prepend_frame_count, bool print_payload_only,
        bool ignore_dummy_bursts)
      : gr::block("bursts_printer",
              gr::io_signature::make(0, 0, 0),
              gr::io_signature::make(0, 0, 0))
    {
        d_prepend_string = prepend_string;
        d_prepend_fnr = prepend_fnr;
        d_prepend_frame_count = prepend_frame_count;
        d_print_payload_only = print_payload_only;
        d_ignore_dummy_bursts = ignore_dummy_bursts;

        message_port_register_in(pmt::mp("bursts"));
        set_msg_handler(pmt::mp("bursts"), boost::bind(&bursts_printer_impl::bursts_print, this, boost::placeholders::_1));
    }

    /*
     * Our virtual destructor.
     */
    bursts_printer_impl::~bursts_printer_impl()
    {
    }


  } /* namespace gsm */
} /* namespace gr */